The first they see is a wall of dust. 它们首先看到一道尘土墙
a lake the size of the Irish Sea is unleashed. 一个像爱尔兰海那么大的湖泊 倾泻而下
...a seemingly unstoppable barrier... 似乎坚不可摧的屏障
On the far side, the wall was almost a kilometer high... 在远端 这堵墙有近1000米高
What started as a series of meltwater streams 最初的融水溪流
To overcome the challenges of a more hostile world, 为了克服恶劣环境所带来的挑战